posted by harry on .
A rocket weighs 1 x10^7 N while on the surface of the earth. The ignition of its engines results in a lift off force of 1.5 X 10^7 N
a) what is the mass of the rocket.
b) what is its acceleration at lift -off
c)How fast will it be moving if it acceleartion at this rates for 10 minutes.
d) How high will it be after 10 minutes.
1 the weight is mg, solve for m
2 Lift off force=mg + ma solve for a
vf=at change t to seconds
h=1/2 a t^2
The reality is that the weight of the rocket decreases as fuel is burned. I suppose your teacher wants to ignore that.
Thank you Mr Bob Pursley